Air Service Boys Over the Enemy's Lines; Or, The German Spy's Secret

THE DUEL IN MIDAIR.
Air Service Boys Over The Enemy's Lines
The German Spy's Secret
CHARLES AMORY BEACH
Author of Air Service Boys Flying for France
ILLUSTRATED BY
ROBERT GASTON HERBERT
THE WORLD SYNDICATE PUBLISHING CO. CLEVELAND, O. NEW YORK, N.Y.
Copyright, 1919, BY GEORGE SULLY & COMPANY
Printed in the United States of America by THE COMMERCIAL BOOKBINDING CO. CLEVELAND, O.
AIR SERVICE BOYS OVER THE ENEMY LINES
CONTENTS